package com.test.com.bluetoothchatandroid.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.os.SystemClock;
import android.util.Log;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by ${cs} on 2018/4/17.
 */

public class CrashHandler implements Thread.UncaughtExceptionHandler {

	public static String TAG = "MyCrash";
	// 系统默认的UncaughtException处理类
	private Thread.UncaughtExceptionHandler mDefaultHandler;

	private static CrashHandler instance = new CrashHandler();
	private Context mContext;

	// 用来存储设备信息和异常信息
	private Map<String, String> infos = new HashMap<String, String>();

	// 用于格式化日期,作为日志文件名的一部分
	private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");

	/** 保证只有一个CrashHandler实例 */
	private CrashHandler() {
	}

	/** 获取CrashHandler实例 ,单例模式 */
	public static CrashHandler getInstance() {
		return instance;
	}

	/**
	 * 初始化
	 *
	 * @param context
	 */
	public void init(Context context) {
		mContext = context;
		// 获取系统默认的UncaughtException处理器
		mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
		// 设置该CrashHandler为程序的默认处理器
		Thread.setDefaultUncaughtExceptionHandler(this);
//		autoClear(5);
	}

	/**
	 * 当UncaughtException发生时会转入该函数来处理
	 */
	@Override
	public void uncaughtException(Thread thread, Throwable ex) {
		if (!handleException(ex) && mDefaultHandler != null) {
			// 如果用户没有处理则让系统默认的异常处理器来处理
			mDefaultHandler.uncaughtException(thread, ex);
		} else {
			SystemClock.sleep(3000);
			// 退出程序
			android.os.Process.killProcess(android.os.Process.myPid());
			System.exit(1);
		}
	}

	/**
	 * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
	 *
	 * @param ex
	 * @return true:如果处理了该异常信息; 否则返回false.
	 */
	private boolean handleException(Throwable ex) {
		if (ex == null)
			return false;

		try {
			// 使用Toast来显示异常信息
			new Thread() {

				@Override
				public void run() {
					Looper.prepare();
					Toast.makeText(mContext, "很抱歉,程序出现异常,即将重启.",
							Toast.LENGTH_LONG).show();
					Looper.loop();
				}
			}.start();
			// 收集设备参数信息
			collectDeviceInfo(mContext);
			// 保存日志文件
			saveCrashInfoFile(ex);
			SystemClock.sleep(3000);
		} catch (Exception e) {
			e.printStackTrace();
		}

		return true;
	}

	/**
	 * 收集设备参数信息
	 *
	 * @param ctx
	 */
	public void collectDeviceInfo(Context ctx) {
		try {
			PackageManager pm = ctx.getPackageManager();
			PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
					PackageManager.GET_ACTIVITIES);
			if (pi != null) {
				String versionName = pi.versionName + "";
				String versionCode = pi.versionCode + "";
				infos.put("versionName", versionName);
				infos.put("versionCode", versionCode);
			}
		} catch (PackageManager.NameNotFoundException e) {
			Log.e(TAG, "an error occured when collect package info", e);
		}
		Field[] fields = Build.class.getDeclaredFields();
		for (Field field : fields) {
			try {
				field.setAccessible(true);
				infos.put(field.getName(), field.get(null).toString());
			} catch (Exception e) {
				Log.e(TAG, "an error occured when collect crash info", e);
			}
		}
	}

	/**
	 * 保存错误信息到文件中
	 * @param ex
	 * @return 返回文件名称,便于将文件传送到服务器
	 * @throws Exception
	 */
	private String saveCrashInfoFile(Throwable ex) throws Exception {
		StringBuffer sb = new StringBuffer();
		try {
			SimpleDateFormat sDateFormat = new SimpleDateFormat(
					"yyyy-MM-dd HH:mm:ss");
			String date = sDateFormat.format(new Date());
			sb.append("\r\n" + date + "\n");
			for (Map.Entry<String, String> entry : infos.entrySet()) {
				String key = entry.getKey();
				String value = entry.getValue();
				sb.append(key + "=" + value + "\n");
			}

			Writer writer = new StringWriter();
			PrintWriter printWriter = new PrintWriter(writer);
			ex.printStackTrace(printWriter);
			Throwable cause = ex.getCause();
			while (cause != null) {
				cause.printStackTrace(printWriter);
				cause = cause.getCause();
			}
			printWriter.flush();
			printWriter.close();
			String result = writer.toString();
			sb.append(result);

			String fileName = writeFile(sb.toString());
			return fileName;
		} catch (Exception e) {
			Log.e(TAG, "an error occured while writing file...", e);
			sb.append("an error occured while writing file...\r\n");
			writeFile(sb.toString());
		}
		return null;
	}

	private String writeFile(String sb) throws Exception {
		String time = formatter.format(new Date());
		String fileName = "crash-" + time + ".log";
		if (checkSaveLocationExists()) {
			String path = getGlobalpath();
			File dir = new File(path);
			if (!dir.exists())
				dir.mkdirs();

			FileOutputStream fos = new FileOutputStream(path + fileName, true);
			fos.write(sb.getBytes());
			fos.flush();
			fos.close();
		}
		return fileName;
	}

	public static String getGlobalpath() {
		return Environment.getExternalStorageDirectory().getAbsolutePath()
				+ File.separator + "crash" + File.separator;
	}

	public static void setTag(String tag) {
		TAG = tag;
	}

	/**
	 * 文件删除
	 */
	/*public void autoClear(final int autoClearDay) {
		FileUtil.delete(getGlobalpath(), new FilenameFilter() {

			@Override
			public boolean accept(File file, String filename) {
				String s = FileUtil.getFileNameWithoutExtension(filename);
				int day = autoClearDay < 0 ? autoClearDay : -1 * autoClearDay;
				String date = "crash-" + DateUtil.getOtherDay(day);
				return date.compareTo(s) >= 0;
			}
		});

	}*/

	public static boolean checkSaveLocationExists() {
		String sDCardStatus = Environment.getExternalStorageState();
		boolean status;
		if (sDCardStatus.equals(Environment.MEDIA_MOUNTED)) {
			status = true;
		} else
			status = false;
		return status;
	}

}
